Godhood
When Lan was at this strongest, he had already reached the rank of an Overlord. Due to the seal he had put on himself, he had previously dropped to the King Rank of the Mortal World, which was the same as the difference between heaven and earth.
Even until now, he had still been stuck in the ranks of the mortal world. Although he had slowly been loosening the seal, he had not been able to reach the threshold of an immortal, but due to the epiphany, his seal made a jolt, resulting in him reaching the Deity Realm.
The Deity Realm was split into numerous ranks, but one needed to fulfill specific criteria to reach the next ranks.
Unlike the mortal realms where one could be promoted as long as they had gained enough energy, the promotions through the ranks of a Deity depended on one's comprehension.